Authorities say 77-year-old Hudy Muldrow Sr. has been charged with death by auto.

Credit: CBS

Investigators say he tried to merge onto Interstate 80 in Mount Olive and then turned sharply toward a U-turn area on May 17. The bus and a dump truck then collided, killing 10-year-old fifth-grader Miranda Vargas and 51-year-old Jennifer Williamson.